Nut machine



Dec. 3, 1929.

e. 8. SMITH 1,738,124}

NUT MACHINE Original Filed March 29. 1926 2 Sheets-Sheet 1 INVENTOR.

W mwm M1) ATTORNEYS.

G. 5. SMITH NUT MACHINE Dec. 3, 1929.

Original Filed March 29. 1926 2 Sheets-Sheet 2 INVENTOR 7 f A TTORNEYSPatented Dec. 3, 1929 UNITED STATES PATENT OFFICE GEORGE S, SMITH, OFPITTSBURGH, PENNSYLVANIA, ASSIGNOR TO ZPITTSBURGH SCREW AND BOLTCORPORATION, A CORPORATION OF PENNSYLVANIA NUT MACHINE Originalapplication filed March 29, 1926, Serial No. 98,180.

This invention relates to metal working machines and more particularlyto'nut making machines for manufacturing nuts from bars of stock; andthis application is division of my copending application for notmachines, filed March 29, 1926, Serial No. 98,180.

An object of this invention is to provide a machine of the characterdescribed which is of simple construction and which is more effective inoperation than similar machines now in use and known to me.

A further object is to provide an improved stock feeding mecl anism formachines of the type set forth.

A still further object is to provide a stock feeding and straighteningmechanism specially adapted for use with machines operating upon aplurality of bars of stock.

These and other objects which will be apparent to those skilled in thisparticular art are accomplished by means of the invention illustrated inthe accompanying drawings, in which Figure 1 is an elevation of afeeding mechanism constructed in accordance with one form of thisinvention. Fig. 2 is a plan view thereof. Fig. 3 is an elevation showingcertain details of a gripping mcchaism. Fig. 4 is atransverse sectionalview on the line H of Fig. 3 and Fig. 5 is a View in side elevationshowing the operating means for coordinating and synchronizing thefeeding and gripping mechanisms.

The particular feeding mechanism illustrated is employed forintermittently feeding twobars of stock into an associated nut makingmachine, and a clamping mechanism is associated with each feeding devicefor firmly clamping each bar against movement during operation of themachine plunger head.

The feed devices are operated by a single drive mechanism which is alsoconnected with stock grippers as to synchronize the operation of thelatter with relation to the feeding devices. As illustrated, the latterare em ployed in feeding two separate bars of stock 21 and theindividual feeds are driven from a single operating means which itselfis actuated from the power shaft of th machine. As illustrated, upperfeed rolls 62 are mounted on the adjacent ends of separate alignedDivided and this application filed January Serial No. 246,588.

shafts 63 suitably supported in bearing blocks 6 1- slidahly mounted ina bearing block housing 65, see Fig. 13, and springs 66 are associatedwith each bearing block for yicldingly pressing the upper rolls 62downwardly against the stock bar and into contact with lower feed rolls67 on a feed shaft 68 mounted in bearing blocks (39 in the housing inwhich they are adj ustably supported by threaded block supportingmembers 70. The upper feed roll supporting shafts 68 are geared to thelower feed roll supporting shaft 68 by intermeshing' gears 71. A driveshaft 7-1 mounted in the housing 6.3 is geared to the lower feed shaft68 through gears 73 and projects outwardly at one side of the machineframe. A ratchet 74 is secured to the pro jetting end of the shaft 7 2and is intermittently rotated by pawls 75 mounted on a pawl siuiport-ingsegmental arm 7 6 loosely supported upon the feed mechanism operatingshaft adjacent the ratchet. The pawl supporting segment 76 is providedwith an out wardly extending slotted arm 7 7 and the lower end of anoperating bar 78 is adjustably secured in the slot of the ratchetoperating arm 7 78 is associated with a cam 79 on the power shaft 45 ofthe machine for oscillating the pawls 75 to intermittently rotate theratchet wheel 74, as is well known in the art.

The outer end of the arm 7 7 is connected by a link 80 to a crank arm 81secured to a shaft 82 supported in bearings formed in a plate 83 boltedto the feed shaft housing 65 which also supports the gripper mechanismfor gripping and straightening the stock between feeding" movements. Aseparate gripper is provided for each stock bar and each mocl'ianism isopera-ted by a separate cam 84 on the shaft 82. Each cam engages a camroller 85 mounted in the lower end of a. gripper slide 86 reciprocablymounted in recesses 87 in the gripper housing below each stock bar.Removable wear members 88 are secured in the top of each gripper slideand are provided with spaced stock bar engaging portions 89 for engagingthe lower face of the stock bar upon upward movement of the slide so asto clamp the bar against a projection 90 formed in a l The upper end ofthe operating rod removable wear member 91 mounted in the upper end ofthe gripper slide recess above the stock bar and positioned so as toengage the upper face of the bar between the points of engagement'of thelower gripper member on the lower face, see Fig. 12. As a result of thisform of gripper mechanism, each stock bar is simultaneously gripped andstraightcried in case of irregularities in the contour of the bar. Theamount of feed given the bars is adjusted by varying the position of thelower end of the operating rod 78 in the slotted arm 7 7 but it will beapparent that such adjustment can have no effect upon the operation ofthe gripper slide so that although the same mechanism operates bothdevices theone can be adjusted without affecting the other.

Inop'eratiomthe bars of stock are simultaneously and intermittently fedinto the machine through the intermittent rotation of the single drivingratchet 74 which operates the separate feed rollers for each bar. Theupper feed rollers 62 being separately spring pressed by the spring 66against the associated bar of stock, each roller can yield independentlyof the other roller to accommodate slight irregularities which may bepresent in the formation of each bar of stock.

After the bars have been fed the predetermined distance, and while thefee-d rollers are stationary, the operating rod 78 which has caused thefeeding movement then rotates the gripper o aerating cams 84, through"as a straightening mechanism.

Although I have described what I now consider to be the preferredembodiment of Y this invention, it will be obvious that various changes,additions, substitutions and omissions can be made therein withoutdeparting from the spirit of this invention or the scope of the appendedclaims.

WVhat I claim as new and desire to secure by LettersPatent is:

1. The combination in a nut,making machine of means for intermittentlyfeeding stock thereto, means for straightening said stock betweenfeeding movements and a bar for actuating said feeding and straighteningmeans.

2. The combination in a nut making machine of means for intermittentlyfeeding stock thereto, including a ratchet, a slide adapted toengage-the "stock between feeding movements and means including anoperating bar for intermittently rotating said ratchet and -alsoreciprocating said slide in timed relation.

3. The combination in a nut making machine of means for intermittentlyfeeding stock thereto including a ratchet wheel, a pawl supportingsegment having an outwardly extending arm associated therewith, agripper slide, an oscillatory cam for reciprocating said slide and meansconnecting said arm with said cam whereby operation of said arm causessaid slide to grip said stock between feeding movements.

4:. The combination in a nut making machine of means for intermittentlyfeeding stock thereto including a ratchet wheel, a pawl supportingsegment having an outwardly extending arm associated therewith, agripper slide, an oscillatory cam for reciprocating said slide, meansfor connecting said arm with said cam whereby operation of said armcauses said slide to grip said stock between feeding movements and meansfor adjusting the extent of movement of said feeding means withoutvarying the operation of said gripper slide.

5. The combination in a nut making machine of means for intermittentlyfeeding a bar of stock thereto, a gripper for bolding said stock betweenfeeding movements and for gripping said stock on opposite sides thereofat spaced points so as to straighten said stock, and an operating barfor actuating the feeding mechanism and also the gripping means.

6. The combination in a nut making machine of means for intermittentlyfeeding stock thereto, a gripper for holding said stock between feedingmovements, a pawl and ratchet for operating said feed rolls, and a linkconnecting means associated with said ratchet and operated by movementof said pawls to operate said gripper in synchronism with the feeding ofsaid stock.

In testimony whereof, I have hereunto subscribed my name this 11th dayof January,

GEORGE S. SMITH.

